Paper Info
Title
A 100-V Battery Charger Voltage Extender IC With 97% Efficiency at 4-A and ±0.5% Voltage Accuracy
Abstract
This paper presents an IC that extends the voltage capability of a low voltage battery charger to 100V for accurately and reliably charging lithium ion (Li-Ion) battery stacks of up to 18 cells. The IC interfaces with a buck converter battery charger that utilizes external nFET control and an external inductor current sensing resistor. The voltage extender IC provides voltage level translation for the nFET control signals and the current sensing function while supporting an input power supply voltage of up to 100V and output battery voltage of up to 80V. The inductor current sense voltage is translated with a ping-pong amplifier capable of driving a bi-directional input voltage to a fully differential output with a maximum load current of 10 mA at 20 MHz bandwidth and less than <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$500~\mu \text{V}$ </tex-math></inline-formula> offset. The combined system of the voltage extender IC and battery charger achieved 97% efficiency at a 4-A charging current. The battery charging voltage accuracy was better than ± 0.5% at 80V.
Year
DOI
Venue
2020
10.1109/TCSI.2020.2974627
IEEE Transactions on Circuits and Systems I: Regular Papers
Keywords
DocType
Volume
Voltage control,Integrated circuits,Battery chargers,Batteries,Inductors,Current control,Resistors
Journal
67
Issue
ISSN
Citations 
7
1549-8328
0
PageRank 
References 
Authors
0.34
0
2
Name
Order
Citations
PageRank
Bradford L. Hunter130.84
Wallace Ed Matthews200.34